&GAS: EXTRAPOLATIONS


item

  The table item to be extrapolated, the following are known:

  ------------------------------------------------------------------------
  Item                           Description
  ------------------------------------------------------------------------
  [HIGH-]DRIFT-VELOCITY          Drift velocity beyond the highest E/p
  LOW-DRIFT-VELOCITY             Drift velocity below the first E/p
  [HIGH-]ION-MOBILITY            Ion mobility beyond the highest E/p
  LOW-ION-MOBILITY               Ion mobility below the first E/p
  [HIGH-]LORENTZ-ANGLE           Lorentz angle beyond the highest E/p
  LOW-LORENTZ-ANGLE              Lorentz angle below the first E/p
  [HIGH-]LONGITUDINAL-DIFFUSION  Long. diffusion beyond the highest E/p
  LOW-LONGITUDINAL-DIFFUSION     Long. diffusion below the first E/p
  [HIGH-]TRANSVERSE-DIFFUSION    Transv. diffusion beyond the highest E/p
  LOW-TRANSVERSE-DIFFUSION       Transv. diffusion below the first E/p
  [HIGH-]TOWNSEND-COEFFICIENT    Townsend coefficient beyond highest E/p
  LOW-TOWNSEND-COEFFICIENT       Townsend coefficient below first E/p
  [HIGH-]ATTACHMENT-COEFFICIENT  Attachment coefficient beyond highest E/p
  LOW-ATTACHMENT-COEFFICIENT     Attachment coefficient below first E/p
  ------------------------------------------------------------------------

  The prefix HIGH- is optional for backwards compatibility.
  DIFFUSION can be used instead of LONGITUDINAL-DIFFUSION.

method

  The extrapolation method to be used: CONSTANT, EXPONENTIAL or LINEAR.

  Constant extrapolation means values for any E/p outside the range
  of the table are set to the value for the first or last E/p in the
  table, as appropriate.

  In the case of linear and exponential extrapolation the first or
  last two table points are used as basis for the extrapolation.

Keyword index. Formatted on 10/11/98.